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alsa-mixer: Detect and then drop pointless paths in the path set.

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In order to try and avoid 'spamming' the user with port choices,
attempt to detect and remove any pointless paths in a path set. That is
any paths which are subsets of other paths.

This should solve a problem case with some USB Headsets which result in
two paths both involving the 'Speaker' element. When no 'Master' element
exists (which is quite common on head/handsets), then the first path
(analog-output) will contain the 'Speaker' in a way that completely fits
with in the use of the 'Speaker' element in the other path
(analog-output-speaker).
This commit is contained in:
Colin Guthrie 2011-07-02 18:14:48 +01:00
parent 85834107a0
commit 5c832a5b8a
3 changed files with 197 additions and 6 deletions
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3
src/modules/alsa/alsa-source.c
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@ -1516,9 +1516,6 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
goto fail;
pa_alsa_path_set_probe(u->mixer_path_set, u->mixer_handle, ignore_dB);
pa_log_debug("Probed mixer paths:");
pa_alsa_path_set_dump(u->mixer_path_set);
}
return;